<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div class="a">hello world</div>
    <button>删除</button>

    <script src="../lib/jquery.min.js"></script>
    <script>

        $('button').on('click', () => {
            $('.a').remove();
        });

        $('.a').attr({
            style: 'color: red;',
        });

        $('.a').removeAttr('style');


    </script>

</body>
</html>